OpenArena is a community-produced deathmatch FPS based on GPL idTech3 technology. There are many game types supported including Free For All, Capture The Flag, Domination, Overload, Harvester, and more. There are 17 unique player models to choose from and 12 weapons.
yup, it's quake alright, and now that it's on the desura system, updating should be a breeze, hopefully mods will start to pop up.